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src/share/vm/memory/metaspaceShared.hpp@8c95980d0b66 (annotated)

src/share/vm/memory/metaspaceShared.hpp

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 10026

8c95980d0b66

parent 8604

04d83ba48607

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f

aoqi@0	1	/*
jiangli@8509	2	* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24	#ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP
aoqi@0	25	#define SHARE_VM_MEMORY_METASPACE_SHARED_HPP
aoqi@0	26
aoqi@0	27	#include "memory/allocation.hpp"
aoqi@0	28	#include "memory/memRegion.hpp"
aoqi@0	29	#include "runtime/virtualspace.hpp"
aoqi@0	30	#include "utilities/exceptions.hpp"
aoqi@0	31	#include "utilities/macros.hpp"
aoqi@0	32
ccheung@7103	33	#define LargeSharedArchiveSize (300*M)
ccheung@7103	34	#define HugeSharedArchiveSize (800*M)
iklam@7322	35	#define ReadOnlyRegionPercentage 0.39
iklam@7322	36	#define ReadWriteRegionPercentage 0.50
iklam@7322	37	#define MiscDataRegionPercentage 0.09
ccheung@7103	38	#define MiscCodeRegionPercentage 0.02
ccheung@7103	39	#define LargeThresholdClassCount 5000
ccheung@7103	40	#define HugeThresholdClassCount 40000
ccheung@7103	41
ccheung@7103	42	#define SET_ESTIMATED_SIZE(type, region) \
ccheung@7103	43	Shared ##region## Size = FLAG_IS_DEFAULT(Shared ##region## Size) ? \
ccheung@7104	44	(uintx)(type ## SharedArchiveSize * region ## RegionPercentage) : Shared ## region ## Size
ccheung@7103	45
aoqi@0	46	class FileMapInfo;
aoqi@0	47
aoqi@0	48	// Class Data Sharing Support
aoqi@0	49	class MetaspaceShared : AllStatic {
aoqi@0	50
aoqi@0	51	// CDS support
aoqi@0	52	static ReservedSpace* _shared_rs;
aoqi@0	53	static int _max_alignment;
iklam@7089	54	static bool _link_classes_made_progress;
iklam@7089	55	static bool _check_classes_made_progress;
iklam@7089	56	static bool _has_error_classes;
iklam@7089	57	static bool _archive_loading_failed;
jiangli@8509	58	static bool _remapped_readwrite;
aoqi@0	59	public:
aoqi@0	60	enum {
ccheung@7300	61	vtbl_list_size = 17, // number of entries in the shared space vtable list.
ccheung@7300	62	num_virtuals = 200, // maximum number of virtual functions
ccheung@7300	63	// If virtual functions are added to Metadata,
ccheung@7300	64	// this number needs to be increased. Also,
ccheung@7300	65	// SharedMiscCodeSize will need to be increased.
ccheung@7300	66	// The following 2 sizes were based on
ccheung@7300	67	// MetaspaceShared::generate_vtable_methods()
ccheung@7300	68	vtbl_method_size = 16, // conservative size of the mov1 and jmp instructions
ccheung@7300	69	// for the x64 platform
ccheung@7300	70	vtbl_common_code_size = (1*K) // conservative size of the "common_code" for the x64 platform
aoqi@0	71	};
aoqi@0	72
aoqi@0	73	enum {
aoqi@0	74	ro = 0, // read-only shared space in the heap
aoqi@0	75	rw = 1, // read-write shared space in the heap
aoqi@0	76	md = 2, // miscellaneous data for initializing tables, etc.
aoqi@0	77	mc = 3, // miscellaneous code - vtable replacement.
aoqi@0	78	n_regions = 4
aoqi@0	79	};
aoqi@0	80
aoqi@0	81	// Accessor functions to save shared space created for metadata, which has
aoqi@0	82	// extra space allocated at the end for miscellaneous data and code.
aoqi@0	83	static void set_max_alignment(int alignment) {
aoqi@0	84	CDS_ONLY(_max_alignment = alignment);
aoqi@0	85	}
aoqi@0	86
aoqi@0	87	static int max_alignment() {
aoqi@0	88	CDS_ONLY(return _max_alignment);
aoqi@0	89	NOT_CDS(return 0);
aoqi@0	90	}
aoqi@0	91
iklam@7089	92	static void prepare_for_dumping() NOT_CDS_RETURN;
aoqi@0	93	static void preload_and_dump(TRAPS) NOT_CDS_RETURN;
iklam@7089	94	static int preload_and_dump(const char * class_list_path,
iklam@7089	95	GrowableArray<Klass*>* class_promote_order,
iklam@7089	96	TRAPS) NOT_CDS_RETURN;
aoqi@0	97
aoqi@0	98	static ReservedSpace* shared_rs() {
aoqi@0	99	CDS_ONLY(return _shared_rs);
aoqi@0	100	NOT_CDS(return NULL);
aoqi@0	101	}
aoqi@0	102
aoqi@0	103	static void set_shared_rs(ReservedSpace* rs) {
aoqi@0	104	CDS_ONLY(_shared_rs = rs;)
aoqi@0	105	}
aoqi@0	106
iklam@7089	107	static void set_archive_loading_failed() {
iklam@7089	108	_archive_loading_failed = true;
iklam@7089	109	}
aoqi@0	110	static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false);
aoqi@0	111	static void initialize_shared_spaces() NOT_CDS_RETURN;
aoqi@0	112
aoqi@0	113	// Return true if given address is in the mapped shared space.
aoqi@0	114	static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
aoqi@0	115
aoqi@0	116	static void generate_vtable_methods(void** vtbl_list,
aoqi@0	117	void** vtable,
aoqi@0	118	char** md_top, char* md_end,
aoqi@0	119	char** mc_top, char* mc_end);
aoqi@0	120	static void serialize(SerializeClosure* sc);
aoqi@0	121
aoqi@0	122	// JVM/TI RedefineClasses() support:
aoqi@0	123	// Remap the shared readonly space to shared readwrite, private if
aoqi@0	124	// sharing is enabled. Simply returns true if sharing is not enabled
aoqi@0	125	// or if the remapping has already been done by a prior call.
aoqi@0	126	static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true);
jiangli@8509	127	static bool remapped_readwrite() {
jiangli@8509	128	CDS_ONLY(return _remapped_readwrite);
jiangli@8509	129	NOT_CDS(return false);
jiangli@8509	130	}
aoqi@0	131
aoqi@0	132	static void print_shared_spaces();
iklam@7089	133
iklam@7089	134	static bool try_link_class(InstanceKlass* ik, TRAPS);
iklam@7089	135	static void link_one_shared_class(Klass* obj, TRAPS);
iklam@7089	136	static void check_one_shared_class(Klass* obj);
iklam@7089	137	static void link_and_cleanup_shared_classes(TRAPS);
ccheung@7103	138
ccheung@7103	139	static int count_class(const char* classlist_file);
ccheung@7103	140	static void estimate_regions_size() NOT_CDS_RETURN;
aoqi@0	141	};
aoqi@0	142	#endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP